here and here, have referred to:
the Polesotechnic League
the Terran Empire
- but have not mentioned many of the rich interconnections between these people, peoples and planets:
van Rijn employed Falkayn to lead his first trade pioneer crew;
Ythrians transported van Rijn to Mirkheim;
Falkayn had discovered Mirkheim, a natural source of supermetals, and founded the Supermetals Company, thus breaking his oath of fealty to van Rijn;
nevertheless, Falkayn married van Rijn's granddaughter and became acting CEO of van Rijn's company while the latter tried to patch together the Polesotechnic League;
Falkayn also founded the human-Ythrian colony on Avalon;
his descendant, Tabitha Falkayn, was part of the successful Avalonian resistance to annexation by the Terran Empire;
later, Dominic Flandry prolonged the life of the Terran Empire and expected planets like Avalon to build new civilizations.
Thus, everything, however apparently disconnected, fits together.